Heat sink



FIG. 1 is a top perspective view of the heat sink.

FIG. 2 is a left side elevation view of the heat sink of FIG. 1.

FIG. 3 is a right side elevation view of the heat sink of FIG. 1.

FIG. 4 is a front elevation view of the heat sink of FIG. 1.

FIG. 5 is a rear elevation view of the heat sink of FIG. 1.

FIG. 6 is a top plan view of the heat sink of FIG. 1; and,

FIG. 7 is a bottom plan view of the heat sink of FIG. 1.

The evenly dotted broken lines in the drawings illustrate portions of the heat sink and form no part of the claimed design. 

CLAIM The ornamental design for a heat sink, as shown and described. 